AT&T's acquisition of T-Mobile and its immediate aftermath dominated the news …

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Back to the front of the pack: Ars reviews Firefox 4: Mozilla has released Firefox 4, the latest version of the open source Web browser. Ars takes a close hands-on look at the updated browser, which brings performance improvements, synchronization support, and a significant user interface overhaul.

Did file-sharing cause recording industry collapse? Economists say no: Big Content dominates the global debate about file sharing with a master narrative that emphasizes music industry revenue and job losses. But the London School of Economics says that file sharing is creating a new economy that governments need to promote rather than criminalize.